Characterization by Photoluminescence and Raman Spectroscopy of the Oxide Scales Grown on the PM2000 at High Temperatures

IF 1 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Molecular and Engineering Materials Pub Date : 2019-09-25 DOI:10.1142/s2251237319500035

Samiha Hakkar, S. Achache, F. Sanchette, Z. Mekhalif, N. Kamoun, A. Boumaza

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引用次数: 6

Abstract

The microstructural change of a thermal oxidation on a PM2000 superalloy was investigated after a 48 h isothermal heat-treatment. The oxides (transitions aluminas, [Formula: see text]-alumina and mixed oxides) were characterized using the Raman spectroscopy, the Photoluminescence (PL) spectroscopy, MEB observations and the X-ray diffraction for temperatures between 600°C and 1200°C. The X-ray diffraction results under conventional incidence conditions make it possible to estimate the crystallites size and the specific surfaces of the [Formula: see text]-alumina. The PL analyses at various excitation wavelengths (200[Formula: see text]nm, 234[Formula: see text]nm, 326[Formula: see text]nm and 532[Formula: see text]nm) provide important information on the existing defects (intrinsic and extrinsic) according to the oxidation temperature. The Raman spectroscopy ([Formula: see text].18[Formula: see text]nm) gives the various signatures of the various alumina generated ([Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]-Al2O3).

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高温下PM2000上生长的氧化皮的光致发光和拉曼光谱表征

研究了PM2000高温合金经48小时等温热处理后热氧化的微观结构变化。在600°C至1200°C的温度下，使用拉曼光谱、光致发光（PL）光谱、MEB观察和X射线衍射对氧化物（过渡氧化铝，[公式：见正文]-氧化铝和混合氧化物）进行了表征。常规入射条件下的X射线衍射结果可以估计[公式：见正文]-氧化铝的晶粒尺寸和比表面。根据氧化温度，在各种激发波长（200[公式：见正文]nm、234[公式：见图正文]nm，326[公式：见正文]nm和532[公式：看正文]nm）下的PL分析提供了关于存在缺陷（内在和外在）的重要信息。拉曼光谱（[公式：见正文].18[公式：看正文]nm）给出了所生成的各种氧化铝的各种特征（[公式，见正文]、[公式，看正文]、【公式，见文本】和【公式，看文本】-Al2O3）。

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Journal of Molecular and Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

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